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Disallow modifying statistics on system columns.

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Reported-by: Heikki Linnakangas
Discussion: https://postgr.es/m/df3e1c41-4e6c-40ad-9636-98deefe488cd@iki.fi
This commit is contained in:
Jeff Davis 2024-11-22 12:07:46 -08:00
parent efdc7d7475
commit 869ee4f10e
3 changed files with 44 additions and 0 deletions
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14
src/backend/statistics/attribute_stats.c
View File

@ -167,6 +167,13 @@ attribute_statistics_update(FunctionCallInfo fcinfo, int elevel)
stats_check_required_arg(fcinfo, attarginfo, ATTNAME_ARG);
attname = PG_GETARG_NAME(ATTNAME_ARG);
attnum = get_attnum(reloid, NameStr(*attname));
if (attnum < 0)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("cannot modify statistics on system column \"%s\"",
NameStr(*attname))));
if (attnum == InvalidAttrNumber)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_COLUMN),
@ -882,6 +889,13 @@ pg_clear_attribute_stats(PG_FUNCTION_ARGS)
stats_check_required_arg(fcinfo, attarginfo, ATTNAME_ARG);
attname = PG_GETARG_NAME(ATTNAME_ARG);
attnum = get_attnum(reloid, NameStr(*attname));
if (attnum < 0)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("cannot clear statistics on system column \"%s\"",
NameStr(*attname))));
if (attnum == InvalidAttrNumber)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_COLUMN),

15
src/test/regress/expected/stats_import.out
View File

@ -195,6 +195,15 @@ SELECT pg_catalog.pg_set_attribute_stats(
avg_width => 2::integer,
n_distinct => 0.3::real);
ERROR: "relation" cannot be NULL
-- error: attribute is system column
SELECT pg_catalog.pg_set_attribute_stats(
relation => 'stats_import.test'::regclass,
attname => 'xmin'::name,
inherited => false::boolean,
null_frac => 0.1::real,
avg_width => 2::integer,
n_distinct => 0.3::real);
ERROR: cannot modify statistics on system column "xmin"
-- error: attname doesn't exist
SELECT pg_catalog.pg_set_attribute_stats(
relation => 'stats_import.test'::regclass,
@ -204,6 +213,12 @@ SELECT pg_catalog.pg_set_attribute_stats(
avg_width => 2::integer,
n_distinct => 0.3::real);
ERROR: column "nope" of relation "test" does not exist
-- error: attribute is system column
SELECT pg_catalog.pg_clear_attribute_stats(
relation => 'stats_import.test'::regclass,
attname => 'ctid'::name,
inherited => false::boolean);
ERROR: cannot clear statistics on system column "ctid"
-- error: attname doesn't exist
SELECT pg_catalog.pg_clear_attribute_stats(
relation => 'stats_import.test'::regclass,

15
src/test/regress/sql/stats_import.sql
View File

@ -145,6 +145,15 @@ SELECT pg_catalog.pg_set_attribute_stats(
avg_width => 2::integer,
n_distinct => 0.3::real);
-- error: attribute is system column
SELECT pg_catalog.pg_set_attribute_stats(
relation => 'stats_import.test'::regclass,
attname => 'xmin'::name,
inherited => false::boolean,
null_frac => 0.1::real,
avg_width => 2::integer,
n_distinct => 0.3::real);
-- error: attname doesn't exist
SELECT pg_catalog.pg_set_attribute_stats(
relation => 'stats_import.test'::regclass,
@ -154,6 +163,12 @@ SELECT pg_catalog.pg_set_attribute_stats(
avg_width => 2::integer,
n_distinct => 0.3::real);
-- error: attribute is system column
SELECT pg_catalog.pg_clear_attribute_stats(
relation => 'stats_import.test'::regclass,
attname => 'ctid'::name,
inherited => false::boolean);
-- error: attname doesn't exist
SELECT pg_catalog.pg_clear_attribute_stats(
relation => 'stats_import.test'::regclass,